Compact PAPR Impeller Airflow Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing powered air purifying respirator (PAPR) configurations suffer from inefficient airflow, leading to reduced respiratory protection, increased energy consumption, and user discomfort due to bulky designs that impede mobility.
Innovation Solution
A compact, mask-mountable PAPR design featuring a motor-operated impeller with S-shaped fan blades and a flow straightener with S-shaped fins, which directs airflow directly to the user's breathing zone, minimizing internal air travel and pressure losses, thereby enhancing airflow efficiency and reducing bulk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a convoluted air flow path is used in previously known PAPR configurations, then the blower unit can be designed with more space for component placement, but this results in pressure losses and increased power consumption
Solution Approach 1:
The air flow path is segmented into distinct functional zones: inlet area, impeller rotation area, flow straightener area, and outlet area. Each zone is optimized for its specific function, allowing the air flow to move through defined paths that reduce unnecessary turbulence and pressure losses while maintaining compact dimensions.
Solution Approach 2:
The patent transitions from traditional horizontal air flow paths to a vertical air flow configuration where air moves radially outward from the impeller and is directed downward through the flow straightener to the outlet. This dimensional change reduces the internal travel distance of air and minimizes pressure losses.
2Ease of operation
If previously known PAPR configurations are designed to be bulky, then more space is available for internal components, but this impedes user mobility and freedom of movement
Solution Approach 1:
The patent merges the blower unit, filter cartridge, flow straightener, and outlet into a single integrated compact assembly that can be directly mounted to the user's mask. This consolidation eliminates the need for separate bulky components and external hoses, significantly improving user mobility while maintaining all necessary functional elements.
Solution Approach 2:
The design employs a nested configuration where the impeller is positioned within the housing, the flow straightener is integrated into the lower housing, and the outlet is configured for direct attachment to the mask. This nesting approach maximizes space utilization and minimizes the overall volume of the device.
3Productivity
If air travels through excessive distance inside the PAPR assembly, then more components can be accommodated, but this increases pressure losses and reduces airflow efficiency
Solution Approach 1:
The flow straightener with S-shaped fins is positioned to immediately redirect the radial airflow from the impeller downward toward the outlet. This preliminary action of flow redirection occurs at the point of radial discharge, preventing the air from traveling through excessive distance inside the housing and reducing pressure losses before the air reaches the outlet.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The compact design provides improved respiratory protection with decreased energy consumption and increased user mobility by ensuring efficient airflow and reduced bulk, while maintaining comfort and freedom of movement.
Implementation Method 1
A motor-operated impeller is rotated to cause air to be drawn in through the housing inlet, and generally S-shaped fan blades on the impeller direct the air radially outward from the bottom of the impeller
Implementation Method 2
The radial airflow immediately meets S-shaped fins on a flow straightener that redirect the airflow downward through the housing outlet
Data Source
AI summary
A compact, mask-mountable powered air purifying respirator (“PAPR”) includes a housing and an impeller driven by a motor to draw air in through an inlet in the housing and direct the air to an outlet at an opposite end of the housing. The impeller comprises S-shaped fan blades that direct the air radially outward from the bottom of the impeller. The radial airflow meets S-shaped fins on a flow straightener that redirect the airflow downward through the PAPR housing outlet. The fan blades and flow straightener drive the airflow directly and efficiently, without unnecessary travel of air through the PAPR assembly, thus providing an improved airflow efficiency.